Regulatory Matters - ACC General Retail Rate Cases (Details) $ in Millions	Jun. 13, 2025 USD ($) $ / KWH_Kilowatt_hour	Feb. 22, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
Revenue increase (decrease)		$ 491.7
ACC
Public Utilities, General Disclosures [Line Items]
Recommended return on equity, percentage		9.55%
Increment of fair value rate, percentage		0.25%
ACC | Rate Case Filing with Arizona Corporation Commission | ACC
Public Utilities, General Disclosures [Line Items]
Base fuel and purchased power costs rate (in dollars per kWh) | $ / KWH_Kilowatt_hour	0.043881
APS | ACC
Public Utilities, General Disclosures [Line Items]
Proposed base rate increase	$ 579.5
Total revenue deficiency	$ 662.4
APS | Rate Case Filing with Arizona Corporation Commission | ACC
Public Utilities, General Disclosures [Line Items]
Approximate percentage of increase in average residential customer bill	13.99%
Rate matter, cost base rate	$ 12,500.0
Effective fair value percentage		4.39%